Sand vehicle

ABSTRACT

A sand vehicle has a main frame, an auxiliary frame disposed in the main frame, a rear shaft, a pair of connection bars, and a first and a second positioning seats disposed on the auxiliary frame, a pair of torsion-resistant elements, a pair of sleeves disposed on the first positioning seat to receive the torsion-resistant elements, a connection frame disposed on the main frame, a pair of positioning bars disposed on the main frame, the main frame having two rear distal bars, a pair of pivot shafts, a pair of torsion-resistant members, a pair of collars to receive the torsion-resistant members, a pair of connection rods connected to the collars and the pivot shafts, and two rear wheels connected to the rear shaft. Each rear distal bar of the main frame has a pivot aperture. Each positioning bar has a pivot hole. The torsion-resistant elements are disposed between the positioning bars. The collars are disposed in the second positioning seat. The pivot shafts are disposed on the rear distal bars. A pair of shock absorbers are disposed between the connection frame and the connection bars.

BACKGROUND OF THE INVENTION

The present invention relates to a sand vehicle. More particularly, thepresent invention relates to a sand vehicle which increases a balance ofa main frame and decrease a vibration of the main frame.

Referring to FIGS. 1 and 2, a conventional sand vehicle has a main frame10, an engine 11 disposed on the main frame 10, a shock absorber 13disposed on a rear portion of the main frame 10, a rear shaft 12disposed on the rear portion of the main frame 10, and two rear wheels14 connected to the rear shaft 12. When a user turns his body rightwardor leftward, the engine 11 will deflect rightward or leftward also. Thusthe conventional sand vehicle will be overturned because of theinstability of the center of gravity. Furthermore, one shock absorber 13for two rear wheels 14 cannot decrease a vibration of the conventionalsand vehicle effectively while the user drives the conventional sandvehicle on an uneven road.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a sand vehicle whichhas an auxiliary frame disposed in a main frame, an engine disposed inthe auxiliary frame and a shaft disposed on a rear portion of theauxiliary frame so that the balance of the main frame will not beinfluence by the auxiliary frame while the auxiliary frame is deflected.

Another object of the present invention is to provide a sand vehiclewhich has a pair of torsion-resistant elements and a pair oftorsion-resistant members to be deformed and restored to their originalconfigurations so that a main frame will not be deflected in order tostabilize the center of gravity of the main frame.

Another object of the present invention is to provide a sand vehiclewhich has a pair of shock absorbers for a pair of rear wheels in orderto decrease a vibration of the sand vehicle effectively while the sandvehicle is driven on an uneven road.

Accordingly, a sand vehicle comprises.a main frame, an auxiliary framedisposed in the main frame, an engine disposed in the auxiliary frame, arear shaft disposed on a rear portion of the auxiliary frame, a firstpositioning seat disposed on a front portion of the auxiliary frame, asecond positioning seat disposed on the rear portion of the auxiliaryframe, a pair of torsion-resistant elements, a pair of sleeves disposedon the first positioning seat to receive the torsion-resistant elements,a pair of connection bars disposed on the rear portion of the auxiliaryframe, a connection frame disposed on a rear portion of the main frame,a pair of positioning bars disposed on a front portion of the main frameto match the first positioning seat, the main frame having two reardistal bars, a pair of pivot shafts, a pair of torsion-resistantmembers, a pair of collars to receive the torsion-resistant members, apair of connection rods connected to the collars and the pivot shafts,and two rear wheels connected to the rear shaft. Each of the rear distalbars of the main frame has a pivot aperture. Each of the positioningbars has a pivot hole. The torsion-resistant elements are disposedbetween the positioning bars. A pivot screw rod fastens thetorsion-resistant elements and the positioning bars together. Thecollars are disposed in the second positioning seat. The pivot shaftsare disposed on the rear distal bars. Each of the pivot shafts passesthrough the corresponding pivot aperture of the rear distal bars. A pairof shock absorbers are disposed between the connection frame and theconnection bars.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective exploded view of a sand vehicle of the priorart;

FIG. 2 is an elevational view of a sand vehicle of the prior art;

FIG. 3 is a perspective exploded view of a sand vehicle of a preferredembodiment in accordance with the present invention;

FIG. 4 is an elevational view of a sand vehicle of a preferredembodiment in accordance with the present invention;

FIG. 4A is an elevational view of a sleeve and a torsion-resistantelement;

FIG. 5 is a schematic view illustrating a balance state of a sandvehicle of a preferred embodiment in accordance with the presentinvention; and

FIG. 6 is a schematic view illustrating a buffer state of a sand vehicleof a preferred embodiment in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 3 to 6, a sand vehicle comprises a main frame 20, anauxiliary frame 30 disposed in the main frame 20, an engine 31 disposedin the auxiliary frame 30, a rear shaft 51 disposed on a rear portion ofthe auxiliary frame 30, a first positioning seat 32 disposed on a frontportion of the auxiliary frame 30, a second positioning seat 32′disposed on the tear portion of the auxiliary frame 30, a pair oftorsion-resistant elements 34, a pair of sleeves 33 disposed on thefirst positioning seat 32 to receive the torsion-resistant elements 34,a pair of connection bars 35 disposed on the rear portion of theauxiliary frame 30, a connection frame 25 disposed on a rear portion ofthe main frame 20, a pair of positioning bars 21 disposed on a frontportion of the main frame 20 to match the first positioning seat 32, themain frame 20 having two rear distal bars 21′, a pair of pivot shafts23′, a,pair of torsion-resistant members 34′, a pair of collars 33′ toreceive the torsion-resistant members 34′, a pair of connection rods 331connected to the collars 33′ and the pivot shafts 23′, and two rearwheels 50 connected to the rear shaft 51.

Each of the rear distal bars 21′ of the main frame 20 has a pivotaperture 22′.

Each of the positioning bars 21 has a pivot hole 22.

The torsion-resistant elements 34 are disposed between the positioningbars 21.

A pivot screw rod 23 fastens the torsion-resistant elements 34 and thepositioning bars 21 together.

A nut 24 engages with the pivot screw rod 23.

The collars 33′ are disposed in the second positioning seat 32′.

The pivot shafts 23′ are disposed on the rear distal bars 21′.

Each of the pivot shafts 23′ passes through the corresponding pivotaperture 22′ of the rear distal bars 21′ to engage with a nut 24′.

A pair of shock absorbers 40 are disposed between the connection frame25 and the connection bars 35.

Each of the torsion-resistant elements 34 is made of rubber. Each of thetorsion-resistant members 34′ is made of rubber.

The present invention provides the engine 31 disposed in the auxiliaryframe 30 and the rear shaft 51 disposed on the rear portion of theauxiliary frame 30 so that the balance of the main frame 20 will not beinfluence by the auxiliary frame 30 while the auxiliary frame 30 isdeflected.

The present invention provides a pair of torsion-resistant elements 34and a pair of torsion-resistant members 34′ to be deformed and restoredto their original configurations so that the main frame 20 will not bedeflected in order to stabilize the center of gravity of the main frame20.

The present invention provides a pair of shock absorbers 40 for a pairof rear wheels 50 in order to decrease a vibration of the sand vehicleeffectively while the sand vehicle is driven on an uneven road.

The invention is not limited to the above embodiment but variousmodification thereof may be made. Further, various changes in form anddetail may be made without departing from the scope of the presentinvention.

I claim:
 1. A sand vehicle comprises: a main frame, an auxiliary framedisposed in the main frame, an engine disposed in the auxiliary frame, arear shaft disposed on a rear portion of the auxiliary frame, a firstpositioning seat disposed on a front portion of the auxiliary frame, asecond positioning seat disposed on the rear portion of the auxiliaryframe, a pair of torsion-resistant elements, a pair of sleeves disposedon the first positioning seat to receive the torsion-resistant elements,a pair of connection bars disposed on the rear portion of the auxiliaryframe, a connection frame disposed on a rear portion of the main frame,a pair of positioning bars disposed on a front portion of the main frameto match the first positioning seat, the main frame having two reardistal bars, a pair of pivot shafts, a pair of torsion-resistantmembers, a pair of collars to receive the torsion-resistant members, apair of connection rods connected to the collars and the pivot shafts,and two rear wheels connected to the rear shaft, each of the rear distalbars of the main frame having a pivot aperture, each of the positioningbars having a pivot hole, the torsion-resistant elements disposedbetween the positioning bars, a pivot screw rod fastening thetorsion-resistant elements and the positioning bars together, thecollars disposed in the second positioning seat, the pivot shaftsdisposed on the rear distal bars, each of the pivot shafts passingthrough the corresponding pivot aperture of the rear distal bars, and apair of shock absorbers disposed between the connection frame and theconnection bars.
 2. The sand vehicle as claimed in claim 1, wherein eachof the torsion-resistant elements is made of rubber.
 3. The sand vehicleas claimed in claim 1, wherein each of the torsion-resistant members ismade of rubber.